inabox/InABox.Avalonia.Platform/Barcodes/CameraView/CameraView.axaml.cs

using Avalonia;
using Avalonia.Controls;
using Avalonia.Markup.Xaml;
using Avalonia.Platform;
using Avalonia.Threading;
using InABox.Core;
using Microsoft.Maui.Graphics.Platform;
using System.Timers;
using System.Windows.Input;
using Timer = System.Timers.Timer;

namespace InABox.Avalonia.Platform.Barcodes;

public interface ICameraViewControl : ILoggable
{
    IPlatformHandle CreateControl(CameraView view, IPlatformHandle parent);
}
public class DefaultCameraViewControl : ICameraViewControl
{
    public Logger? Logger { get; set; }

    public IPlatformHandle CreateControl(CameraView view, IPlatformHandle parent)
    {
        return null;
    }
}

public partial class CameraView : UserControl
{
    public static readonly StyledProperty<ICommand> OnDetectionFinishedCommandProperty = 
        AvaloniaProperty.Register<CameraView, ICommand>(nameof(OnDetectionFinishedCommand));
    public ICommand OnDetectionFinishedCommand
    {
        get => GetValue(OnDetectionFinishedCommandProperty);
        set => SetValue(OnDetectionFinishedCommandProperty, value);
    }

    public static readonly StyledProperty<ICommand> OnImageCapturedCommandProperty = 
        AvaloniaProperty.Register<CameraView, ICommand>(nameof(OnImageCapturedCommand));
    public ICommand OnImageCapturedCommand
    {
        get => GetValue(OnImageCapturedCommandProperty);
        set => SetValue(OnImageCapturedCommandProperty, value);
    }

    public static readonly StyledProperty<bool> VibrationOnDetectedProperty = 
        AvaloniaProperty.Register<CameraView, bool>(nameof(VibrationOnDetected), false);
    public bool VibrationOnDetected
    {
        get => GetValue(VibrationOnDetectedProperty);
        set => SetValue(VibrationOnDetectedProperty, value);
    }

    public static readonly StyledProperty<bool> CameraEnabledProperty = 
        AvaloniaProperty.Register<CameraView, bool>(nameof(CameraEnabled), false);
    public bool CameraEnabled
    {
        get => GetValue(CameraEnabledProperty);
        set => SetValue(CameraEnabledProperty, value);
    }

    public static readonly StyledProperty<bool> PauseScanningProperty = 
        AvaloniaProperty.Register<CameraView, bool>(nameof(PauseScanning), false);
    public bool PauseScanning
    {
        get => GetValue(PauseScanningProperty);
        set => SetValue(PauseScanningProperty, value);
    }

    public static readonly StyledProperty<bool> ForceInvertedProperty = 
        AvaloniaProperty.Register<CameraView, bool>(nameof(ForceInverted), false);
    public bool ForceInverted
    {
        get => GetValue(ForceInvertedProperty);
        set => SetValue(ForceInvertedProperty, value);
    }

    public static readonly StyledProperty<bool> TorchOnProperty = 
        AvaloniaProperty.Register<CameraView, bool>(nameof(TorchOn), false);
    public bool TorchOn
    {
        get => GetValue(TorchOnProperty);
        set => SetValue(TorchOnProperty, value);
    }

    public static readonly StyledProperty<bool> TapToFocusEnabledProperty = 
        AvaloniaProperty.Register<CameraView, bool>(nameof(TapToFocusEnabled), false);
    public bool TapToFocusEnabled
    {
        get => GetValue(TapToFocusEnabledProperty);
        set => SetValue(TapToFocusEnabledProperty, value);
    }

    public static readonly StyledProperty<CameraFacing> CameraFacingProperty = 
        AvaloniaProperty.Register<CameraView, CameraFacing>(nameof(CameraFacing), CameraFacing.Back);
    public CameraFacing CameraFacing
    {
        get => GetValue(CameraFacingProperty);
        set => SetValue(CameraFacingProperty, value);
    }

    public static readonly StyledProperty<CaptureQuality> CaptureQualityProperty = 
        AvaloniaProperty.Register<CameraView, CaptureQuality>(nameof(CaptureQuality), CaptureQuality.Medium);
    public CaptureQuality CaptureQuality
    {
        get => GetValue(CaptureQualityProperty);
        set => SetValue(CaptureQualityProperty, value);
    }

    public static readonly StyledProperty<BarcodeFormats> BarcodeSymbologiesProperty = 
        AvaloniaProperty.Register<CameraView, BarcodeFormats>(nameof(BarcodeSymbologies), BarcodeFormats.All);
    public BarcodeFormats BarcodeSymbologies
    {
        get => GetValue(BarcodeSymbologiesProperty);
        set => SetValue(BarcodeSymbologiesProperty, value);
    }

    public static readonly StyledProperty<bool> AimModeProperty = 
        AvaloniaProperty.Register<CameraView, bool>(nameof(AimMode), false);
    public bool AimMode
    {
        get => GetValue(AimModeProperty);
        set => SetValue(AimModeProperty, value);
    }

    public static readonly StyledProperty<bool> ViewfinderModeProperty = 
        AvaloniaProperty.Register<CameraView, bool>(nameof(ViewfinderMode), false);
    public bool ViewfinderMode
    {
        get => GetValue(ViewfinderModeProperty);
        set => SetValue(ViewfinderModeProperty, value);
    }

    public static readonly StyledProperty<bool> CaptureNextFrameProperty = 
        AvaloniaProperty.Register<CameraView, bool>(nameof(CaptureNextFrame), false);
    public bool CaptureNextFrame
    {
        get => GetValue(CaptureNextFrameProperty);
        set => SetValue(CaptureNextFrameProperty, value);
    }

    public static readonly StyledProperty<bool> ForceFrameCaptureProperty = 
        AvaloniaProperty.Register<CameraView, bool>(nameof(ForceFrameCapture), false);
    public bool ForceFrameCapture
    {
        get => GetValue(ForceFrameCaptureProperty);
        set => SetValue(ForceFrameCaptureProperty, value);
    }

    public static readonly StyledProperty<float> RequestZoomFactorProperty = 
        AvaloniaProperty.Register<CameraView, float>(nameof(RequestZoomFactor), -1f);
    public float RequestZoomFactor
    {
        get => GetValue(RequestZoomFactorProperty);
        set => SetValue(RequestZoomFactorProperty, value);
    }

    public static readonly StyledProperty<float> CurrentZoomFactorProperty = 
        AvaloniaProperty.Register<CameraView, float>(nameof(CurrentZoomFactor), -1f);
    public float CurrentZoomFactor
    {
        get => GetValue(CurrentZoomFactorProperty);
        set => SetValue(CurrentZoomFactorProperty, value);
    }

    public static readonly StyledProperty<float> MinZoomFactorProperty = 
        AvaloniaProperty.Register<CameraView, float>(nameof(MinZoomFactor), -1f);
    public float MinZoomFactor
    {
        get => GetValue(MinZoomFactorProperty);
        set => SetValue(MinZoomFactorProperty, value);
    }

    public static readonly StyledProperty<float> MaxZoomFactorProperty = 
        AvaloniaProperty.Register<CameraView, float>(nameof(MaxZoomFactor), -1f);
    public float MaxZoomFactor
    {
        get => GetValue(MaxZoomFactorProperty);
        set => SetValue(MaxZoomFactorProperty, value);
    }

    public static readonly StyledProperty<float[]> DeviceSwitchZoomFactorProperty = 
        AvaloniaProperty.Register<CameraView, float[]>(nameof(DeviceSwitchZoomFactor), []);
    public float[] DeviceSwitchZoomFactor
    {
        get => GetValue(DeviceSwitchZoomFactorProperty);
        set => SetValue(DeviceSwitchZoomFactorProperty, value);
    }

    public CameraView()
    {
        InitializeComponent();

        LayoutUpdated += CameraView_LayoutUpdated;
    }

    private void CameraView_LayoutUpdated(object? sender, EventArgs e)
    {
        Host.TryUpdateNativeControlPosition();
    }

    public void DetectionFinished(HashSet<BarcodeResult> barCodeResults)
    {
        // if (_poolingTimer.Enabled)
        // {
        //     _poolingTimer.Stop();
        // }
        TriggerOnDetectionFinished(barCodeResults);
    }

    private void TriggerOnDetectionFinished(HashSet<BarcodeResult> barCodeResults)
    {
        Dispatcher.UIThread.InvokeAsync(() =>
        {
            if(OnDetectionFinishedCommand?.CanExecute(barCodeResults) ?? false)
            {
                OnDetectionFinishedCommand?.Execute(barCodeResults);
            }
        });
    }
    public void TriggerOnImageCaptured(PlatformImage image)
    {
        Dispatcher.UIThread.InvokeAsync(() =>
        {
            CaptureNextFrame = false;

            if (PauseScanning)
                return;

            // OnImageCaptured?.Invoke(this, new OnImageCapturedEventArg { Image = image });
            if (OnImageCapturedCommand?.CanExecute(image) ?? false)
                OnImageCapturedCommand?.Execute(image);
        });
    }
}

internal class CameraViewControlHost : NativeControlHost
{
    protected override IPlatformHandle CreateNativeControlCore(IPlatformHandle parent)
    {
        if(Parent is CameraView cameraView)
        {
            return PlatformTools.CameraViewControl.CreateControl(cameraView, parent)
                ?? base.CreateNativeControlCore(parent);
        }
        else
        {
            return base.CreateNativeControlCore(parent);
        }
    }
}